AIIMS Chemistry Questions

Which has least covalent radius.

The complete reaction is shown below.

Correct order of electrophilic substitution reaction is:

IUPAC name of

The complete reaction is shown below.

Stability order of following carbocation is :

Correct order of SN2 reaction is:

$\text{A} \xrightarrow{\text{Ph}-\text{SO}_2\text{Cl}} \text{B} \xrightarrow{\text{KOH}} \text{C} \xrightarrow{\text{C}_2\text{H}_5\text{I}} \text{D}$'C' is water solubleCorrect structure of A and D are

Match following coloumn: | Polymer | Monomer | | :--- | :--- | | (i) Buna-S | (P) Styrene | | (ii) ethylene glycol | (Q) terylene | | (iii) elastomer | (R) chloroprene |

Which is least soluble

$$\text{Ph}-\text{CH}_2-\text{CH}=\text{CH}-\text{CH}_3 \xrightarrow[\text{(ii) Alk. KOH}]{\text{(i) Br}_2}$$

Assertion: Phenol is more acidic then m-methoxy phenol Reason: $\text{–OCH}_3$ shows +I effect

Which of the following reacts most slowly with nitric acid.

Find the end product of reaction

Assertion: $\text{CH}_3 - \underset{\substack{| \\ \text{CH}_3}}{\overset{\substack{\text{CH}_3 \\ |}}{\text{C}}} - \text{O} - \text{CH}_3$ React with HBr to form $(\text{CH}_3)_3\text{CBr}$ and $\text{CH}_3\text{OH}$ Reason: It follows SN1 mechanism

$\text{Phenol} + \text{Aniline} \xrightarrow{\text{C}_6\text{H}_5\text{N}_2^+\text{Cl}^- / \text{KOH}} \text{Major Product: Product will be :}$

Compare stability of free radicals (I) $$\text{CH}_3-\dot{\text{C}}\text{H}-\text{CH}_3$$ (II) $$\text{C}_6\text{H}_5-\dot{\text{C}}\text{H}_2$$ (III)$$\dot{\text{C}}\text{H}_2-\text{CH}(\text{CH}_3)_2 \qquad \text{(IV) }\dot{\text{C}}\text{H}_2-\text{CH}_3$$

Assertion : Glyceraldehyde reacts with 2 2 Br /H Oto form achiral compound Reason: –CHO and $\text{–CH}_{2}\text{OH}$ both are oxidized

Product is:

In processing of steel which of the following allotropes of carbon is used.

Assertion : d⁵ configuration is more stable than d⁴ Reason : d⁵ has more exchange energy as compared to d⁴ because 10 & 6 exchanges are possible in d⁵ & d⁴ respectively.

Assertion: Propene reacts with HI in presence of peroxide give¹⁻iodopropane. Reason: 1° free radical is less stable than 2° free radical

Write IUPAC name of following compound

Correct order for reaction with alcoholic KOH

$-\text{NH}-\text{C}(=\text{O})-\text{NH}-\text{NH}_2\text{ group}\rangle \xrightarrow{\text{(i)HCl} / \text{(ii)}\Delta} \text{Major product of following reaction}$

$\langle\text{1-chloro-2-methoxybenzene structure}\rangle \xrightarrow{\text{HNO}_3 / \text{H}_2\text{SO}_4} \text{Major Product, product will be :}$

Which of the following is incorrect about cyanogen gas? (1) It has bent structure (2) It is psuedohalogen. (3) Its behavior is similar to halides. (4) both carbon are sp hybridised

$\text{H}-\overset{\substack{\text{O} \\ ||}}{\text{C}}-\text{H} + \text{CH}_3-\text{CH}=\text{O} \xrightarrow{\text{Conc. NaOH}}$ Find out the products of reaction

Correct order of basic strength is:

Identify structure of ‘P’ and ‘Q’ Correct order of pKa value is:

Which of the following statement is correct for oleum ?

Which is incorrect for paper chromatograph

Assertion: I₂O₅ is used to detect CO. Reason : In I₂O₅ the oxidation number of I is 5.

IUPAC name of give compound:

(i) $\text{F}_3\text{C}-\text{COOH}$ , (ii) $\text{CH}_3\text{COOH}$ , (iii) $\text{C}_6\text{H}_5\text{COOH}$ ,(iv) $\text{CH}_3\text{CH}_2\text{COOH}$ Correct order of $\text{pK}_\text{a}$ value is:

Which of the following complex is optically inactive (1) [RhCl(CO)(PPh₃)(NH₃)] (2) [Fe(C₂O₄)₃]³⁻ (3) [Fe(en)₂Cl₂] (4) [Pd(en)₂Cl₂]

Suitable reagent for following conversion

Assertion: Anhydrides are more reactive than ester for nucleophilic substitution. Reason:– $\text{R.COO}^{-}$ is better leaving group than $\text{R-O}^{-}$

Order of acidic nature

How many spectral line of Balmer series present in visible region :

The complete reaction is shown below.

Assertion: m-Bromotoluene can be prepared by m-toluidene. Reason: Amino group is meta directing

Correct increasing order for the wavelength of absorption in the visible region for the complexes of Co³⁺ is: (1) [Co(CN)₆]³⁻, [Co(NH₃)₆]³⁺, [Co(NH₃)₅(H₂O)]³⁺[Co(NH₃)₅Cl]²⁺ (2) [Co(CN)₆]³⁻, [Co(NH₃)₅(H₂O)]³⁺[Co(NH₃)₅Cl]²⁺ [Co(NH₃)₆]³⁺, (3) [Co(NH₃)₅]²⁺, [Co(CN)₆]³⁻, [Co(NH₃)₅(H₂O)]³⁺[Co(NH₃)₅Cl]²⁺ (4) [Co(NH₃)₅Cl]²⁺, [Co(NH₃)₅(H₂O)]³⁺, [Co(NH₃)₄]³⁺, [Co(CN)₆]³⁻

For a first order gas phase reaction : $$\text{A}_{(\text{g})} \rightarrow 2\text{B}_{(\text{g})} + \text{C}_{(\text{g})}$$ $\text{P}_0$ be initial pressure of A and $\text{P}_t$ the total pressure at time ‘t’. Integrated rate equation is :

Assertion: Two sugar units joined by 1,2-glycosidic bond in sucralose. Reason: It contains 1 C-glucose and 2 C -fructose glycosidic bond

The complete reaction is shown below.

C + O₂(g) ⟶ CO₂ ...... (i); ΔH = -393 kJ mol⁻¹ H₂ + 1/2 Ω₂ ⟶ H₂O ...... (ii); ΔH = -287.3 kJ mol⁻¹ 2CO₂ + 3H₂O ⟶ C₂H₅OH + 3O₂ ...... (iii); ΔH = 1366.8 kJ mol⁻¹ Find the standard enthalpy of formation of C₂H₅OH(l)

Out of $\text{BeF}_2, \text{MgF}_2, \text{CaF}_2, \text{SrF}_2$ which has maximum solubility :

Assertion: Hydroquinone is more acidic than resorcinol. Reason: OH shows I− effect

The complete reaction is shown below.